1.3% 'call the cops' tyre pressure probably make as much difference



etyres "Eamonn Holmes explains why our low overheads = low priced tyres"  At work
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"I can't always believe facts I read on the web" - Charles Dickens

winner by default of the tractor vs caravan race

Thanks for the info!

I'll spend the 250 quid on some new toys opposed to a spare alloy! Seat covers here
I come!

mcphersonstrut wrote:

Calculation:
New tyre rolling circumference
792 (original O/D) x 3.05 = 2416mm
Tyre with 5mm remaining tread depth
782 (O/D worn tyre) x 3.05 = 2385mm
Difference of 31mm
This means that the new tyre will have 31mm further to travel for every revolution of the wheel.
A tyre of this size will rotate approximately 413 times per km, therefore for every km driven the new tyre will travel an extra 12830mm or approx 13 metres!

Here endeth the lesson for today

Which means in layman's English - ya more likely to get a speeding fine with worn tyres rather than new ones  2007 Freelander 2 HSE TD4 Manual with Premium Pack & Moonroof.
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Hmmm I think you made a little mistake there:

How are the kms measured: if it is by tyre rotations it means that the lower the thread on the tyres the slower you actually go...

So based on you calculations for each km you think you drive, you actually drive 13 metres less. So with worn down tyres you must drive about 1% faster to get the same speed as with new tyres. Meaning you are more likely to get a speeding ticket with new tyres then worn out ones!

great scotts he's right you know.  At work
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"I can't always believe facts I read on the web" - Charles Dickens

winner by default of the tractor vs caravan race

Speeding

Speed Limit + 10% + 2mph, anything over that and you will get a speeding ticket. ______________________
2011 Full Fat RR 4.4 TDV8
2012 FL2 SD4 Auto HSE
2013 Kawasaki Versys 650

Dave wrote:

Speeding

Speed Limit + 10% + 2mph, anything over that and you will get a speeding ticket.

35 in a 30 zone before you get a ticket i dont think so ! you might be lucky but i wouldnt guarantee it. 

christian138 wrote:

Dave wrote:

Speeding

Speed Limit + 10% + 2mph, anything over that and you will get a speeding ticket.

35 in a 30 zone before you get a ticket i dont think so ! you might be lucky but i wouldnt guarantee it.

35 by the speedo? or true mph? thats the difference At work
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"I can't always believe facts I read on the web" - Charles Dickens

winner by default of the tractor vs caravan race

My dad got a ticket for 34mph by a gatso Former Mod/Member, with the most post & Chicken George Arch nemesis

Dave wrote:

Speeding

Speed Limit + 10% + 2mph, anything over that and you will get a speeding ticket.

I have just got a ticket 35mph in a 30 you are now allowed 10% only it changed a couple of years back when the Goverment decided the boys in blue could keep the tax money they raise. p****d off with a Digital Keyboard Warrior

My father received a speeding ticket driving through Dumfries & Galloway on the M74. Clearly printed on the paperwork were "Maximum permissible speed 77mph (70 +10% + 2mph)

He got clocked at 92mph  ______________________
2011 Full Fat RR 4.4 TDV8
2012 FL2 SD4 Auto HSE
2013 Kawasaki Versys 650

Dave, that don't add upp 10% of 70 is 77mph + 2 is 79?  p****d off with a Digital Keyboard Warrior

oops typo error (or me maths) ______________________
2011 Full Fat RR 4.4 TDV8
2012 FL2 SD4 Auto HSE
2013 Kawasaki Versys 650

a speed camera will have the rule set by the chief constable so in one area it might be as you say +10% + 2mph but outside a school it might be far less.

also the black rats (Traffic police) have discretion as to when to issue a ticket usually this involves "the attitude test" and the driving conditions/location. so don't be lulled into thinking you can cruise past a police car at 79mph (an immediate fail for the attitude test) 

It it up to each Police force to decide what they set their speed camera activation at. You may well find that a camera in one village will be set at a different activation speed to a camera a few miles away in the next village or two different trunk roads in the same area could be set different. The cameras in my force area are placed at accident 'black spots' or the mobile camera vans can park up within 1km of an accident 'black spot'. But it is just a money making scheme!